Ours, from what I heard, made a large crashing sound, and then a big explosion. The whole kitchen filled with smoke! Before this happened I tried to talk her out of it, but her words were, "I'm older than you, so you can't tell me what to do anyways."
And yet my mom is older than her, and she doesn't listen. Go figure. I then said, "This is bad, and since you won't listen to me, I'm leaving. I'm not getting in trouble when you blow the microwave up." I went downstairs where mom was doing laundry, and about 10 minutes later the kitchen became very noisy!
I didn't bother to tell mom what my sister was doing in the beginning because I'm not one to tell on another person, partly because of my sister; she's was such a tattleteller. And I wanted her to get in trouble for being mean to me. She was always brutal growing up. XD